It is shown that Hapuka otoliths cannot be reliably dated using the /sup 210/Pb//sup 226/Ra method because contrary to previous assumptions, excess /sup 210/Pb is incorporated into the outer layers of otoliths which have been taken from old fish, though the /sup 226/Ra incorporation remains normal. This is shown to apply also to Orange Roughy otoliths. Ages based on calculations using previously published methods will be artificially old. (auth)